1995 GMC 2500 4x4 ECM?

Im getting code 32 for the EGR and code 82 for the transmission which is not shifting correctly. I have been told this wiring loop is on the same fuse, the fuse is good. Is there a way to determine if the computer itself is bad and keeping the truck in this failure mode? I was also told the O2 sensor is in this wiring and may have a hand in this? Has anyone had this problem? if so how do I fix it?